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      The role of oxidative stress, inflammation and acetaminophen exposure from birth to early childhood in the induction of autism

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          Abstract

          The wide range of factors associated with the induction of autism is invariably linked with either inflammation or oxidative stress, and sometimes both. The use of acetaminophen in babies and young children may be much more strongly associated with autism than its use during pregnancy, perhaps because of well-known deficiencies in the metabolic breakdown of pharmaceuticals during early development. Thus, one explanation for the increased prevalence of autism is that increased exposure to acetaminophen, exacerbated by inflammation and oxidative stress, is neurotoxic in babies and small children. This view mandates extreme urgency in probing the long-term effects of acetaminophen use in babies and the possibility that many cases of infantile autism may actually be induced by acetaminophen exposure shortly after birth.

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          Endothelial dysfunction, oxidative stress, and risk of cardiovascular events in patients with coronary artery disease.

          T Heitzer, T Schlinzig, K Krohn … (2001)
          Endothelial function is impaired in coronary artery disease and may contribute to its clinical manifestations. Increased oxidative stress has been linked to impaired endothelial function in atherosclerosis and may play a role in the pathogenesis of cardiovascular events. This study was designed to determine whether endothelial dysfunction and vascular oxidative stress have prognostic impact on cardiovascular event rates in patients with coronary artery disease. Endothelium-dependent and -independent vasodilation was determined in 281 patients with documented coronary artery disease by measuring forearm blood flow responses to acetylcholine and sodium nitroprusside using venous occlusion plethysmography. The effect of the coadministration of vitamin C (24 mg/min) was assessed in a subgroup of 179 patients. Cardiovascular events, including death from cardiovascular causes, myocardial infarction, ischemic stroke, coronary angioplasty, and coronary or peripheral bypass operation, were studied during a mean follow-up period of 4.5 years. Patients experiencing cardiovascular events (n=91) had lower vasodilator responses to acetylcholine (P<0.001) and sodium nitroprusside (P<0.05), but greater benefit from vitamin C (P<0.01). The Cox proportional regression analysis for conventional risk factors demonstrated that blunted acetylcholine-induced vasodilation (P=0.001), the effect of vitamin C (P=0.001), and age (P=0.016) remained independent predictors of cardiovascular events. Endothelial dysfunction and increased vascular oxidative stress predict the risk of cardiovascular events in patients with coronary artery disease. These data support the concept that oxidative stress may contribute not only to endothelial dysfunction but also to coronary artery disease activity.
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            Metabolic biomarkers of increased oxidative stress and impaired methylation capacity in children with autism.

            S. Jill James, Paul Cutler, Stepan Melnyk … (2004)
            Autism is a complex neurodevelopmental disorder that usually presents in early childhood and that is thought to be influenced by genetic and environmental factors. Although abnormal metabolism of methionine and homocysteine has been associated with other neurologic diseases, these pathways have not been evaluated in persons with autism. The purpose of this study was to evaluate plasma concentrations of metabolites in the methionine transmethylation and transsulfuration pathways in children diagnosed with autism. Plasma concentrations of methionine, S-adenosylmethionine (SAM), S-adenosylhomocysteine (SAH), adenosine, homocysteine, cystathionine, cysteine, and oxidized and reduced glutathione were measured in 20 children with autism and in 33 control children. On the basis of the abnormal metabolic profile, a targeted nutritional intervention trial with folinic acid, betaine, and methylcobalamin was initiated in a subset of the autistic children. Relative to the control children, the children with autism had significantly lower baseline plasma concentrations of methionine, SAM, homocysteine, cystathionine, cysteine, and total glutathione and significantly higher concentrations of SAH, adenosine, and oxidized glutathione. This metabolic profile is consistent with impaired capacity for methylation (significantly lower ratio of SAM to SAH) and increased oxidative stress (significantly lower redox ratio of reduced glutathione to oxidized glutathione) in children with autism. The intervention trial was effective in normalizing the metabolic imbalance in the autistic children. An increased vulnerability to oxidative stress and a decreased capacity for methylation may contribute to the development and clinical manifestation of autism.
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              Maternal metabolic conditions and risk for autism and other neurodevelopmental disorders.

              Sidney Walker, Kate Baker, Paula Krakowiak … (2012)
              We examined whether metabolic conditions (MCs) during pregnancy (diabetes, hypertension, and obesity) are associated with autism spectrum disorder (ASD), developmental delays (DD), or impairments in specific domains of development in the offspring. Children aged 2 to 5 years (517 ASD, 172 DD, and 315 controls) were enrolled in the CHARGE (Childhood Autism Risks from Genetics and the Environment) study, a population-based, case-control investigation between January 2003 and June 2010. Eligible children were born in California, had parents who spoke English or Spanish, and were living with a biological parent in selected regions of California. Children's diagnoses were confirmed by using standardized assessments. Information regarding maternal conditions was ascertained from medical records or structured interview with the mother. All MCs were more prevalent among case mothers compared with controls. Collectively, these conditions were associated with a higher likelihood of ASD and DD relative to controls (odds ratio: 1.61 [95% confidence interval: 1.10-2.37; odds ratio: 2.35 [95% confidence interval: 1.43-3.88], respectively). Among ASD cases, children of women with diabetes had Mullen Scales of Early Learning (MSEL) expressive language scores 0.4 SD lower than children of mothers without MCs (P < .01). Among children without ASD, those exposed to any MC scored lower on all MSEL and Vineland Adaptive Behavior Scales (VABS) subscales and composites by at least 0.4 SD (P < .01 for each subscale/composite). Maternal MCs may be broadly associated with neurodevelopmental problems in children. With obesity rising steadily, these results appear to raise serious public health concerns.
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Int Med Res
                Journal ID (iso-abbrev): J. Int. Med. Res
                Journal ID (publisher-id): IMR
                Journal ID (hwp): spimr
                Title: The Journal of International Medical Research
                Publisher: SAGE Publications (Sage UK: London, England )
                ISSN (Print): 0300-0605
                ISSN (Electronic): 1473-2300
                Publication date (Electronic): 16 March 2017
                Publication date (Print): April 2017
                Volume: 45
                Issue: 2
                Pages: 407-438
                Affiliations
                [1 ]Departments of Surgery, Duke University Medical Center, Durham, NC USA
                [2 ]Departments of Pediatrics, Duke University Medical Center, Durham, NC USA
                [3 ]Departments of Pediatrics, Harvard Medical School, Charlestown, MA, USA
                [4 ]Departments of Neurology, Harvard Medical School, Charlestown, MA, USA
                [5 ]Institute for Arctic and Alpine Research, University of Colorado, Boulder, Boulder, CO, USA
                Author notes
                [*]William Parker, Duke University Medical Center, Box 2605, Department of Surgery, Durham, NC 27710, USA. Email: William.parker@ 123456duke.edu
                Article
                Publisher ID: 10.1177_0300060517693423
                DOI: 10.1177/0300060517693423
                PMC ID: 5536672
                PubMed ID: 28415925
                SO-VID: 6774abe3-ff67-4de3-a9b4-2b2ac1a20e83
                Copyright © © The Author(s) 2017
                License:

                This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 3.0 License ( http://www.creativecommons.org/licenses/by-nc/3.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page( https://us.sagepub.com/en-us/nam/open-access-at-sage).

                History
                Date received : 26 September 2016
                Date accepted : 20 January 2017
                Categories
                Subject: Review

                Keywords: autism,inflammation,oxidative stress,acetaminophen,paracetamol,paracetamolo
                Data availability:
                Keywords: autism, inflammation, oxidative stress, acetaminophen, paracetamol, paracetamolo

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